Re: [PATCH 1/3] dt-bindings: pci: qcom: Document PCIe bindings for SC720

[Prasad Malisetty]

On 2021-05-08 01:29, Stephen Boyd wrote:
> Quoting Prasad Malisetty (2021-05-07 03:17:26)
> > Document the PCIe DT bindings for SC7280 SoC.The PCIe IP is similar
> > to the one used on SM8250. Add the compatible for SC7280.
> >
> > Signed-off-by: Prasad Malisetty <pmaliset@xxxxxxxxxxxxxx>
> > ---
> >  Documentation/devicetree/bindings/pci/qcom,pcie.txt | 17 
> > +++++++++++++++++
> >  1 file changed, 17 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt 
> > b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> > index 0da458a..e5245ed 100644
> > --- a/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> > +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
> > @@ -12,6 +12,7 @@
> >                         - "qcom,pcie-ipq4019" for ipq4019
> >                         - "qcom,pcie-ipq8074" for ipq8074
> >                         - "qcom,pcie-qcs404" for qcs404
> > +                       - "qcom,pcie-sc7280" for sc7280
> >                         - "qcom,pcie-sdm845" for sdm845
> >                         - "qcom,pcie-sm8250" for sm8250
> >
> > @@ -133,6 +134,22 @@
> >                         - "slave_bus"   AXI Slave clock
> >
> >  - clock-names:
> > +       Usage: required for sc7280
> > +       Value type: <stringlist>
> > +       Definition: Should contain the following entries
> > +                       - "aux"         Auxiliary clock
> > +                       - "cfg"         Configuration clock
> > +                       - "bus_master"  Master AXI clock
> > +                       - "bus_slave"   Slave AXI clock
> > +                       - "slave_q2a"   Slave Q2A clock
> > +                       - "tbu"         PCIe TBU clock
> > +                       - "ddrss_sf_tbu" PCIe SF TBU clock
> > +                       - "pipe"        PIPE clock
> > +                       - "pipe_src"    PIPE MUX
>
> Is pipe_src necessary? Is it the parent of the pipe clk? If so, please
> remove it and do whatever is necessary on the pipe clk instead of the
> parent of the clk.

Here pipe_src is MUX. Newer targets require changing pipe-clk mux to 
switch between pipe_clk and XO for GDSC enable.
After PHY init, need to configure MUX.
> > +                       - "pipe_ext"    PIPE output clock
>
> Is pipe output different from pipe?
Yes, pipe_ext clock will generate after PHY init.
> > +                       - "ref"         REFERENCE clock
> > +